Lesson 3 Switch Hall Sensor

Introduction

A switch Hall sensor consists of voltage regulator, Hall element, differential amplifier, Schmitt trigger, and output terminal. It outputs digital values.

Components

• 1 * SunFounder Uno board

• 1 * USB data cable

• 1 * Switch Hall sensor module

• 2 * 3-Pin anti-reverse cable

• 1 * Passive buzzer

• 1 * Magnet

Principle

Hook up the switch Hall sensor module with pin 8 of the SunFounder Uno, and the buzzer to pin 7. When an energized conductor approaches the module, the output terminal SIG outputs low level; the buzzer beeps and at the same time the corresponding LED lights up.

Experimental Procedures

Step 1: Build the circuit

The wiring between the switch Hall sensor and SunFounder Uno board:

Switch Hall Sensor	SunFounder Uno
SIG	8
VCC	5V
GND	GND

The wiring between the passive buzzer and SunFounder Uno board:

Passive Buzzer	SunFounder Uno
SIG	7
VCC	5V
GND	GND

Step 2: Open the code file

Step 3: Select correct Board and Port

Step 4: Upload the sketch to the SunFounder Uno board

Code

Now, if a magnet approaches the switch Hall sensor, the indicator light on the sensor will light up and the buzzer will beep. At the same time, the LED attached to pin 13 on the SunFounder Uno board will also light up.

Before

After